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JPS5912700

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DESCRIPTION JPS5912700
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
composite type speaker in which a tweeter speaker for reproducing a high-pitched part is
incorporated in a woo-speaker having a bass part and configured to obtain a high-quality
reproduced sound in a wide band. Configuration of the prior art and its problems In general, a
composite type speaker configured to obtain a high-quality reproduced sound in a wide band by
incorporating a tweeter that reproduces a high-pitched part into a woo-speaker that has a bass
part and reproduces it. There is no place to install a speaker that has a large number of bands,
and it has become a topic in recent years in the field of car audio where it is required to cover all
bands with one speaker, and Hi Fi audio In the field of sound localization from the viewpoint of
sound image localization (it is thought to be because the sound comes from the same direction),
the woofer and tweeter combined speakers have a strong popularity. FIG. 1 shows a conventional
composite speaker. In FIG. 1, 1 is a diaphragm for woofer, 12 is a diaphragm end for woofer, 13
is a diaphragm dust cap for Woono •, 2 is a voice coil bobbin, 3 is a voice coil, 4 is a sun pension
for woofer diaphragm, 5 Is a magnetic circuit magnet for the woofer, 6 is a magnetic circuit top
plate for the woofer, 14 is a lower plate, 7 is an electrical terminal, 16 is an electrical terminal, 8
is a lead wire for the 8, 16 is a lead wire for the ○, 9 is a tweeter Lead wire for O, 17 lead wire
for Q for tweeter, 1 o is piezoelectric element for tweeter, 11 is diaphragm for tweeter, 18 is
tweeter diaphragm edge, 19 is tweeter diaphragm dust cap, 2 o is speaker frame, 21 is a frame
which also serves as tweeter support, and 22 is a tweeter fixing pole. However, since the abovementioned conventional composite type speaker incorporates the tweeter unit in the cone
portion of the woofer diaphragm, the speaker inevitably becomes large, and it is difficult to make
it thinner. There is a drawback that the method of incorporating the speaker is difficult to take,
and there is also the problem that the structure is complicated, the assembly operation takes
time, and the number of parts increases, resulting in an increase in cost. 2 and 3 show an
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example of speaker characteristics and an electrical connection. In FIG. 2, the solid line is the
sound pressure characteristic of the composite speaker, and the small broken line and the large
broken line are the reproduction characteristics of the woofer and tweeter, respectively. It is
usual to insert a capacitor in the series and shut off the low frequency signal because it is
destroyed when the low frequency signal is input to the tweeter 23. However, since the
piezoelectric element can be regarded as a kind of capacitor, the tweeter itself is a low frequency
band There is no need for a capacitor to have the characteristics of signal cut.
In FIG. 3, 24 is a woofer and 24 is a regenerative amplifier. The object of the invention The
present invention is to solve such a conventional drawback. The voice coil constituting the
woofer speaker is a piezoelectric element constituting a tweeter speaker. It is an object of the
present invention to provide a composite type speaker which can be easily combined and can be
thinned at low cost and can be highly efficient by providing the extension part of the above. The
composite speaker of the present invention is configured such that the voice coil bobbin
constituting the woofer speaker is projected to the front side of the woofer speaker diaphragm,
and the piezoelectric coil constituting the tweeter speaker is joined to the projected voice coil
bobbin It is According to this configuration, the piezoelectric element itself that constitutes the
tweeter vibrates to emit sound, and there are two modes in which the piezoelectric element is
driven by the voice coil to produce sound, so the efficiency of the tweeter speaker is high. Also,
since the strength of the speaker diaphragm constituting the woofer speaker is not required to be
too high, it can be lightened to enhance the efficiency of the woofer speaker. Therefore, there is
an advantage that a wide band, high efficiency composite type speaker can be realized.
Description of the Embodiments Hereinafter, embodiments of the present invention will be
described. FIG. 4 shows an embodiment of the present invention. In FIG. 4, 41 is a cone-shaped
diaphragm for woofer, 42 is a bobbin provided on the diaphragm for woofer 41, and 43 is a
lower end of the bobbin 42. A voice coil 44 wound around the outer periphery is a suspension
for supporting the woofer diaphragm 41 so as to be capable of piston movement, and is
suspended between the suspension and a frame 48 described later. 45 is an annular magnet, 46
is an upper plate, 47 is a lower plate having a center pole, these are magnetic circuits having an
annular magnetic gap between the inner peripheral surface of the upper plate 46 and the outer
peripheral surface of the center pole Are configured. A frame 48 is attached to the upper plate
46 constituting the magnetic circuit, the outer peripheral portion of the woofer diaphragm 41 is
attached by a gasket 49 through an edge member 60, and the suspension 44 is attached. .
Reference numeral 51 denotes a diaphragm made of a piezoelectric element constituting a
tweeter speaker, which is attached to an upper end portion of the bobbin 42 which protrudes to
the woofer diaphragm 41 side. The outer peripheral portion of the diaphragm 61 is attached to
the inner peripheral surface of the woofer diaphragm 41 via the edge member 62. 63.54 are +
and-electrical terminals provided on the frame 48 so that an electrical signal is applied to the
piezoelectric element and the voice coil 43 via the woofer lead wire 55.56 and the tweeter lead
wire 57.58 It has become.
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In the composite speaker of such a configuration, the piezoelectric element 61 is coupled to the
upper end of the woofer voice coil bobbin 42, and the positive and negative electrodes are sent
electric signals from the lead wires 57.58. According to this embodiment, in the low frequency
range where the impedance of the piezoelectric element is high, no vibration occurs, and all
vibration types move uniformly in Uno and Stitch. In the middle, high, and low tones, the woofer
cone paper weakens as the strength and does not follow, and the impedance of the piezoelectric
element 51 decreases and vibration starts. The vibration state of the tweeter is schematically
shown in FIGS. FIG. 6a shows a state in which the piezoelectric element is driven by the voice coil
to produce a sound, and FIG. 5 shows a state of sound emission due to the vibration of the
piezoelectric element itself. As a speaker, the state of FIG. 6 a and FIG. Because of this, the
efficiency of the tweeter is high, and the Uno's corn paper also has a tweeter, so there is no need
to put out the high-pitched range, so the strength can be made lighter without much need.
Therefore, the efficiency of the woofer is high, the efficiency of the tweeter is high, and a wideband, high-efficiency speaker can be realized. In addition, since the number of parts is small, the
assembly is simple and the efficiency can be increased. Therefore, when the efficiency is good
and the magnet can be lightened, the cost can be significantly reduced. In addition, since the
piezoelectric element is directly installed on the voice coil bobbin, there is no need for a support
mechanism as in the prior art, and no special magnetic circuit is necessary for the size tweeter, so
thinning can be simplified, which is also efficient. It is done without dropping. In the above
embodiment, a circular piezoelectric element is used and the voice coil bobbin is joined to the
vicinity of the nodal circle of the primary resonance of the piezoelectric element. However, the
shape of the piezoelectric element is arbitrary, And it is obvious that the place where the voice
coil bobbin is tubulard and the alignment method (for example, direct bonding or bonding
through a metal ring) are also optional, and the same effect can be obtained. Further, the outer
peripheral portion of the piezoelectric element 51 as a diaphragm may be directly attached to the
diaphragm for cone-shaped woofer 41 without the edge member 62. Although the piezoelectric
element is used as the diaphragm in the above embodiment, the tweeter diaphragm 61 is joined
to the center of the piezoelectric element 61 coupled to the upper end of the bobbin 42 as shown
in FIG. The outer peripheral portion of the diaphragm 61 may be joined directly to the coneshaped diaphragm 41 for woofer via the edge member 62. In this case, since the diaphragm 61
and the piezoelectric element 61 move as shown in FIGS. 7a and 7b, the same function and effect
are exhibited.
According to the present invention as described above, according to the present invention, the
voice coil bobbin constituting the Uno speaker is made to project to the front side of the
diaphragm for Woono and the piezoelectric element is joined to the upper end of the protruding
bobbin. Since the tweeter speaker is configured, in addition to the vibration of the piezoelectric
element itself, the piezoelectric element is also vibrated by the voice coil, which has an advantage
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that the efficiency of the tweeter speaker becomes high. In addition, it is not required that the
strength of the diaphragm that constitutes the Woonoseupy force be too high in order to
combine the tweeter speaker, and the woofer diaphragm is lightened by that much, and the
efficiency of the woofer speaker can also be enhanced. Therefore, there is an advantage that it is
possible to realize a composite speaker that is suitable for wide band, high efficiency, and
thinning.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a conventional composite speaker, FIG. 2 is a sound pressure
frequency characteristic of the same speaker, FIG. 3 is a circuit diagram of the same speaker, and
FIG. 4 is an embodiment of the composite speaker of the present invention 5a and 5b are
operation explanatory views of the tweeter diaphragm of the same speaker, and FIG. 6 is a cross
sectional view showing another embodiment of the composite speaker according to the present
invention, and FIGS. It is operation ¦ movement explanatory drawing of the tweeter diaphragm of
the speaker.
41 · · · · woofer diaphragm, 42 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 47 ++ ea
· · · φ Lower plate, 48 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
························································································
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · • Name of Agent Attorney Nakao Toshio Other 1 person
Figure 1 Figure 2 tl; Skin J Figure 3? 6 FIG. 4 FIG. 5 α 51313 纂 6 FIG. 7 FIG. 7 α
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